US11309103B2 - Shielded flat cable - Google Patents

Shielded flat cable Download PDF

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Publication number
US11309103B2
US11309103B2 US17/047,844 US201917047844A US11309103B2 US 11309103 B2 US11309103 B2 US 11309103B2 US 201917047844 A US201917047844 A US 201917047844A US 11309103 B2 US11309103 B2 US 11309103B2
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Prior art keywords
wires
ground
signal
wire
flat cable
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US20210166836A1 (en
Inventor
Manabu Nagano
Go HIRAKAWA
Shin Sato
Tatsuo Matsuda
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD. reassignment SUMITOMO ELECTRIC INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAGANO, MANABU, MATSUDA, TATSUO, SATO, SHIN, HIRAKAWA, Go
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H01B7/0861—Flat or ribbon cables comprising one or more screens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • H01B11/10—Screens specially adapted for reducing interference from external sources
    • H01B11/1091—Screens specially adapted for reducing interference from external sources with screen grounding means, e.g. drain wires
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H01B7/0838—Parallel wires, sandwiched between two insulating layers

Definitions

  • the present disclosure relates to a shielded flat cable.
  • the present application is based on and claims priority to Japanese Application No. 2018-082576, filed on Apr. 23, 2018, the entire contents of which are incorporated herein by reference.
  • Flexible flat cables are used to save space and to make easy connections in many fields including audio visual equipment, such as CD and DVD players, office automation equipment, such as copiers and printers, and internal wiring of other electronic and information equipment.
  • audio visual equipment such as CD and DVD players
  • office automation equipment such as copiers and printers
  • internal wiring of other electronic and information equipment The higher the frequency used in the equipment is, the greater the influence of noise is. Thus, shielded flat cables are used.
  • Shielding of the shielded flat cable is achieved by, for example, providing a shield layer outside the FFC.
  • the shield layer is electrically coupled to the ground wire through an opening provided on one side of the ground wire and maintained at the ground potential on a substrate side through the ground wire.
  • Patent Document 1 Japanese Laid-open Patent Publication No. 6-283053
  • a shielded flat cable includes one or more ground wires, the ground wires being arrayed parallel to each other, one or more signal wires arrayed parallel to the one or more ground wires, an insulating layer covering the one or more ground wires and the one or more signal wires, and a shield layer provided on an outer surface of the insulating layer.
  • the insulating layer includes multiple openings of which bottoms are respectively an upper surface and a lower surface of each of the one or more ground wires in a cross-section of the one or more ground wires.
  • the one or more ground wires and the shield layer are electrically coupled at the multiple openings, and each of the one or more signal wires is surrounded by the one or more ground wires and the shield layer.
  • FIG. 1 is a cross-sectional view orthogonal to a longitudinal direction, illustrating a schematic view of a shielded flat cable according to a first embodiment of the present disclosure
  • FIG. 2A is a cross-sectional view orthogonal to the longitudinal direction, for describing an example of a process of manufacturing the shielded flat cable according to the first embodiment of the present disclosure
  • FIG. 2B is a cross-sectional view orthogonal to the longitudinal direction, for describing an example of a process of manufacturing the shielded flat cable according to the first embodiment of the present disclosure
  • FIG. 3 is a cross-sectional view orthogonal to the longitudinal direction, illustrating a schematic view of a shielded flat cable according to a second embodiment of the present disclosure
  • FIG. 4 is a cross-sectional view orthogonal to the longitudinal direction, illustrating a schematic view of a shielded flat cable according to a third embodiment of the present disclosure
  • FIG. 5 is a cross-sectional view orthogonal to the longitudinal direction, illustrating a schematic view of a shielded flat cable according to a fourth embodiment of the present disclosure
  • FIG. 6 is a cross-sectional view orthogonal to the longitudinal direction, illustrating a schematic view of a shielded flat cable according to a fifth embodiment of the present disclosure
  • FIG. 7 is a cross-sectional view orthogonal to the longitudinal direction, illustrating a schematic view of a shielded flat cable according to a sixth embodiment of the present disclosure.
  • FIG. 8 is a cross-sectional view orthogonal to the longitudinal direction, illustrating a schematic view of a shielded flat cable according to a reference example electrically equivalent to the present disclosure.
  • each conductor surrounded by the shielded layer is not easily influenced by noise from the outside of the cable and does not adversely affect the outside of the cable, such as generating noise. Thus, each conductor can achieve high-speed signal transmission. However, crosstalk occurs between conductors surrounded by the shield layer. Additionally, when power wires are provided with conductors, the conductors are influenced by noise transmitted through the power wires.
  • the present disclosure has been made in view of these conditions and aims to provide a shielded flat cable that can shield predetermined signal wires with certainty and that is not easily influenced by external noise and crosstalk.
  • a predetermined signal wire can be surrounded by a ground wire and a shield layer to provide a shielded flat cable that can shield the predetermined signal wire and that is not easily influenced by external noise and crosstalk.
  • a shielded flat cable is a shielded flat cable including one or more ground wires, the ground wires being arrayed parallel to each other, one or more signal wires arrayed parallel to the one or more ground wires, an insulating layer covering the one or more ground wires and the one or more signal wires, and a shield layer provided on an outer surface of the insulating layer.
  • the insulating layer includes multiple openings, the bottoms of which are respectively an upper surface and a lower surface of each of the one or more ground wires in a cross-section orthogonal to a longitudinal direction of the one or more ground wires.
  • the one or more ground wires and the shield layer are electrically coupled at the multiple openings, and each of the one or more signal wires is surrounded by the one or more ground wires and the shield layer.
  • a predetermined signal wire can be surrounded by the ground wire and the shield layer, so that the predetermined signal wire can be shielded with certainty, and is not easily influenced by external noise and crosstalk.
  • the one or more signal wires are arrayed on one end of an array of the one or more ground wires and the one or more signal wires.
  • the one or more signal wires on the one end may be surrounded by a closest ground wire and the shield layer electrically coupled at the multiple openings of which bottoms are respectively an upper surface and a lower surface of the closest ground wire.
  • the closest ground wire is closest to the one or more signal wires on the one end.
  • the signal wire may be surrounded by two ground wires.
  • the signal wire is disposed between the two ground wires, and the two ground wires and the shield layer are electrically coupled at the openings of which bottoms are respectively upper surfaces and lower surfaces of the two ground wires between which the signal wire is disposed.
  • the signal wires preferably include one signal wire for signal transmission or a pair of signal wires arranged adjacent and parallel to each other for differential transmission.
  • each signal wire or each pair of signal wires for differential transmission can be surrounded by the ground wire and the shield layer, so that the signal wire can be shielded with certainty and is not easily influenced by external noise and crosstalk.
  • a resin interlayer may be interposed between the insulating layer and the shield layer.
  • the width of the opening is preferably smaller than or equal to half of the width of the ground wire in the array direction.
  • a power wire of which an outer surface is covered by only the insulating layer may be further included.
  • FIG. 1 is a cross-sectional view orthogonal to the longitudinal direction, illustrating a schematic view of a shielded flat cable according to a first embodiment of the present disclosure
  • FIG. 2A and FIG. 2B are cross-sectional views orthogonal to the longitudinal direction for describing an example of a process of manufacturing the shielded flat cable according to the first embodiment of the present disclosure.
  • a shielded flat cable 1 includes multiple conductors including a pair of signal wires S 1 and S 2 , a ground wire G 1 , and power wires P 1 and P 2 arrayed parallel to each other, a first insulating layer 11 and a second insulating layer 12 covering the conductors, a first shield layer 21 and a second shield layer 22 respectively covering portions of outer surfaces of the first insulating layer 11 and the second insulating layer 12 .
  • the signal wires S 1 and S 2 are positioned at one end in the array direction of conductors of the shielded flat cable 1 .
  • openings 13 and 14 are formed on both sides of the ground wire G 1 .
  • the respective bottom surfaces of the openings 13 and 14 are the upper surface and the lower surface of the ground wire G 1 and extend over the entire length of the ground wire G 1 in the longitudinal direction.
  • the ground wire G 1 and the first shield layer 21 are electrically coupled, and at the opening 14 , the ground wire G 1 and the second shield layer 22 are electrically coupled.
  • the first and second shield layers 21 and 22 are electrically coupled at an end A protruding from a side of the shielded flat cable 1 in the width direction.
  • the shielded flat cable 1 includes terminals at both ends in the longitudinal direction. Except for the terminals at both ends, a protective resin layer covering the entire shielded flat cable 1 (which is not illustrated) may be provided.
  • the signal wires S 1 and S 2 may be, for example, conductive metals, such as copper foil, tin-plated soft copper foil, and may be flat conductors having a thickness from 10 ⁇ m to 100 ⁇ m and a width from about 0.2 mm to 0.8 mm.
  • the signal wires S 1 and S 2 are arrayed with a pitch from 0.5 mm to 1.0 mm.
  • the conductor size and pitch of the signal wires S 1 and S 2 are determined based on requirements of the transmission loss and the characteristic impedance of a differential pair.
  • the arrangement of the signal wires S 1 and S 2 is maintained by interposing the signal wires S 1 and S 2 between the first and second insulating layers 11 and 12 .
  • the signal wire may be a single signal wire when the differential transmission is not performed.
  • the ground wire G 1 is a conductor that, at the same time when the shielded flat cable 1 is connected to a substrate constituting equipment, is electrically coupled to a ground layer of the substrate and grounded.
  • the ground wire G 1 may be configured as a flat conductor similar to the signal wires S 1 and S 2 , but preferably have a width greater than the width of the signal wires S 1 and S 2 , such as a width of about 1 mm to 5 mm.
  • the power wires P 1 and P 2 are conductors that supply power to electronic and electric devices and electronic components to which the shielded flat cable 1 is connected.
  • the power wires P 1 and P 2 may be configured as flat conductors similar to the signal wires S 1 and S 2 , but cross-sectional areas of the power wires P 1 and P 2 are configured to be greater than cross-sectional areas of the signal wires S 1 and S 2 and the ground wire G 1 in accordance with the amount of a flowing current.
  • the power wires P 1 and P 2 may be omitted.
  • the first and second insulating layers 11 and 12 are formed by bonding resin films each having an adhesive layer (which is not illustrated) on an inner surface (i.e., a bonding surface).
  • a general resin film having suitable flexibility is used, and, for example, a versatile resin film, such as a polyester resin, a polyphenylene sulfide resin, and a polyimide resin may be used.
  • the thickness of the resin film is from 9 ⁇ m to 400 ⁇ m.
  • the polyester resin include resin materials such as a polyethylene terephthalate resin, a polyethylene naphthalate resin, and a polybutylene naphthalate resin.
  • the adhesive layers of the first and second insulating layers 11 and 12 layers made of resin materials are used, and examples of the adhesive layers include an adhesive made by adding a flame retardant to a polyester-based resin or a polyolefin-based resin.
  • the adhesive layer is formed with a thickness from 10 ⁇ m to 100 ⁇ m.
  • the first and second insulating layers 11 and 12 are bonded and combined by interposing the pair of signal wires S 1 and S 2 , the ground wire G 1 , and the power wires P 1 and P 2 between the adhesive layers of two resin films in a state in which the adhesive layers face each other, and joining the adhesive layers by applying heat with heating rollers.
  • the first shield layer 21 and the second shield layer 22 each have a thickness of about 10 ⁇ m to 200 ⁇ m.
  • the first shield layer 21 and the second shield layer 22 are each formed using a film of two layers, which are one metal layer and one conductive adhesive layer (which is not illustrated).
  • a metal foil or a metal deposition film formed on an insulating film may be used.
  • metallic materials of the first and second shielding layers 21 and 22 copper or aluminum, which are relatively low cost and has excellent electrical conductivity, is preferably used.
  • the thickness of the first and second shielding layers 21 and 22 is too small, the shielding effect is reduced because the electrical resistance of the shield layer is increased. Conversely, when the thickness of the first and second shield layers 21 and 22 is large, the shielding effect can be obtained, but electrical connection with the ground wire G 1 and the flexibility of the shielded flat cable 1 may be impaired.
  • the first and second shield layers 21 and 22 are bonded, with the conductive adhesive layer being inside, on the first and second insulating layers 11 and 12 , and on the ground wires G 1 at the openings 13 and 14 .
  • the first and second shield layers 21 and 22 are bonded at the ends of the shielded flat cable with conductive adhesive layers, so that the pair of signal wires S 1 and S 2 are surrounded and shielded by the first shield layer 21 , the ground wire G 1 , the second shield layer 22 and the end A.
  • the shielded flat cable 1 is connected to a substrate constituting equipment, and at the same time, the shielded flat cable 1 is electrically connected to a ground layer of the substrate to be grounded.
  • the ground wire G 1 serves as a shield to block noise from sides of the signal wires S 1 and S 2 in the array direction, thereby improving the noise reduction effect.
  • FIGS. 2A and 2B are drawings illustrating an example of a process of manufacturing the shielded flat cable according to the first embodiment of the disclosure.
  • the respective flat conductors which are the signal wires S 1 and S 2 , the ground wire G 1 , and the power wires P 1 and P 2 , are arrayed parallel with predetermined intervals, and from the upper and lower sides, the conductors are interposed between the insulating films provided with inner bonding layers and are joined by heating with heating rollers, thereby producing a long flat cable in which the first and second insulating layers 11 and 12 are seamlessly formed at both surfaces of each conductor.
  • the first and second insulating layers 11 and 12 of both surfaces of the ground wire G 1 are removed with a predetermined width W 2 through the entire length in the longitudinal direction so as to form the openings 13 and 14 .
  • a method of removal a laser processing method, a solvent dissolution method, or a mechanical removal method may be used, for example.
  • the width W 2 of the openings 13 and 14 is preferably smaller than or equal to half of the width W 1 of the ground wire G 1 .
  • the width W 2 of the openings 13 and 14 is preferably greater than or equal to one-third of the width W 1 of the ground wire G 1 in order to maintain electrical connection between the ground wire G 1 and the first and second shield layers 21 and 22 .
  • the width W 2 of the openings 13 and 14 is, for example, 0.3 mm to 2.5 mm.
  • the width W 2 of the openings 13 and 14 is the width of the bottom surfaces of the openings 13 and 14 .
  • the width of the openings 13 and 14 may be of different sizes.
  • the first and second shield layers 21 and 22 which are wider than the width of array positions of the signal wires S 1 and S 2 and the ground wire G 1 , are formed to cover the signal wires S 1 and S 2 and the ground wire G 1 .
  • the first and second shield layers 21 and 22 are not provided at an area in which the power wires P 1 and P 2 are arrayed.
  • the first and second shield layers 21 and 22 can be formed, for example, by bonding two-layer metal foil tapes having a conductive adhesive layer on a metal layer, with the conductive adhesive layer being inside, by heating with heating rollers from both sides of the flat cable illustrated in FIG. 2B .
  • a heat bonding process causes the first and second shield layers 21 and 22 to be electrically coupled to the ground wire G 1 and to be directly electrically coupled to the end A protruding from the side of the flat cable in the width direction.
  • the shielded flat cable 1 obtained in the above-described process is provided with a protective resin layer that covers an entirety of the shielded flat cable 1 except for the terminal, as necessary.
  • the protective resin layer can be formed by bonding two resin films, between which the shielded flat cable 1 is interposed, by heating.
  • FIG. 3 is a cross-sectional view orthogonal to the longitudinal direction, illustrating a schematic view of a shielded flat cable according to a second embodiment of the present disclosure.
  • the first and second shield layers 21 and 22 are formed by bonding two metal foil tapes each having a two-layer structure, in which a conductive adhesive layer is provided on a metal layer, on the flat cable from the front and back sides.
  • signal wires S 1 and S 2 and the ground wire G 1 are covered by one shield layer 23 .
  • a single sheet of metal foil tape is bent in a C shape so that the conductive adhesive layer becomes an inner surface, and a flat cable is inserted from an opening side of the C-shaped metal foil tape until a side of the flat cable reaches an innermost surface of the C-shaped metal foil tape.
  • the metal foil tape is bonded on the first and second insulating layers 11 and 12 and the ground wire G 1 by heating with heating rollers from both sides of the conductor, thereby forming the shield layer 23 .
  • the shield layer provided on both sides of the shielded flat cable 2 can be electrically coupled with certainty.
  • the other components are similar to the components of the first embodiment, so the description will be omitted.
  • FIG. 4 is a cross-sectional view orthogonal to the longitudinal direction, illustrating a schematic view of a shielded flat cable according to a third embodiment of the present disclosure.
  • a shielded flat cable 3 for example, the thickness, the width, and the interval of the signal wires S 1 and S 2 and the permittivity of the first and second insulating layers 11 and 12 are adjusted so that the characteristic impedance becomes a predetermined value (e.g., 90 ⁇ or 100 ⁇ ).
  • resin interlayers 31 and 32 for the impedance adjustment are respectively interposed between the first insulating layer 11 and the first shield layer 21 and between the second insulating layer 12 and the second shield layer 22 at positions where the signal wires S 1 and S 2 are located to facilitate the adjustment of the characteristic impedance.
  • the resin interlayers 31 and 32 may be interposed between the first insulating layer 11 and the first shield layer 21 and between the second insulating layer 12 and the second shield layer 22 by providing an adhesive layer on one surface of each of the resin interlayers 31 and 32 , and then bonding the respective adhesive layers on the first and second insulating layers 11 and 12 in a state in which the respective adhesive layers face toward the first and second insulating layers 11 and 12 .
  • the first and second shield layers 21 and 22 are provided to cover surfaces of the resin interlayers 31 and 32 .
  • FIG. 5 is a cross-sectional view orthogonal to the longitudinal direction, illustrating a schematic view of a shielded flat cable according to a fourth embodiment of the present disclosure.
  • a shielded flat cable 4 of the present embodiment includes multiple conductors arrayed parallel to each other including one ground wire G 0 , the pair of signal wires S 1 and S 2 for differential transmission, one ground wire G 1 , and two power wires P 1 and P 2 .
  • the shielded flat cable 4 includes the first insulating layer 11 and the second insulating layer 12 covering the multiple conductors, and the first shield layer 21 and the second shield layer 22 covering portions of outer surfaces of the first and second insulating layers 11 and 12 , respectively.
  • the resin interlayers 31 and 32 for the impedance adjustment are respectively interposed between the first insulating layer 11 and the first shield layer 21 and between the second insulating layer 12 and the second shield layer 22 at positions where the signal wires S 1 and S 2 are located to facilitate the adjustment of the characteristic impedance.
  • a ground wire G 0 is disposed on a side opposite to the ground wire G 1 in the array direction of the pair of signal wires S 1 and S 2 (an end A side), the openings 15 and 16 are formed in the longitudinal direction of the first and second insulating layers 11 and 12 covering both sides of the ground wire G 0 , and the first and second shield layers 21 and 22 are electrically coupled to the ground wire G 0 at the respective openings 15 and 16 .
  • the pair of signal wires S 1 and S 2 of the shielded flat cable 4 is surrounded and shielded by the ground wire G 0 , the first shield layer 21 , the ground wire G 1 , and the second shield layer 22 .
  • the ground wires G 0 and G 1 are symmetrically arranged on both sides of the pair of signal wires S 1 and S 2 in the array direction, excellent transmission characteristics can be obtained.
  • the first and second shield layers 21 and 22 may not be directly contacted by the end A protruding from the side surface of the flat cable in the width direction.
  • FIG. 6 is a cross-sectional view orthogonal to the longitudinal direction, illustrating a schematic view of a shielded flat cable according to a fifth embodiment of the disclosure.
  • a shielded flat cable 5 of the present embodiment includes multiple conductors arrayed parallel to each other including the pair of signal wires S 1 and S 2 for the differential transmission, one ground wire G 1 , a pair of signal wires S 3 and S 4 for the differential transmission, one ground wire G 2 , and two power wires P 1 and P 2 .
  • the signal wires S and the ground wires G are arrayed from the end A side in an array of SSGSSG.
  • the shielded flat cable 5 includes the first insulating layer 11 and the second insulating layer 12 that are respectively disposed on both sides of the multiple conductors, and the first shield layer 21 and the second shielding layer 22 that respectively cover portions of outer surfaces of the first and second insulating layers 11 and 12 .
  • the array of the signal wires S 1 and S 2 and the ground wire G 1 is the same as the array in the first embodiment, but the signal wires S 3 and S 4 and the ground wire G 2 are arrayed between the ground wire G 1 and the power wire P 1 .
  • the ground wire G 1 and the ground wire G 2 are arranged on both sides of the signal wires in the array direction.
  • Exposed surfaces are formed on both surfaces of the ground wire G 1 by the openings 13 and 14 provided in the first and second insulating layers 11 and 12 , and similarly, exposed surfaces are formed on both surfaces of the ground wire G 2 by openings 17 and 18 provided in the first and second insulating layers 11 and 12 through the entire length of the ground wire G 2 in the longitudinal direction.
  • the ground wire G 1 and the first and second shield layers 21 and 22 are electrically coupled at the openings 13 and 14
  • the ground wire G 2 and the first and second shield layers 21 and 22 are electrically coupled at the openings 17 and 18 .
  • the pair of signal wires S 1 and S 2 located at an end of the shielded flat cable 5 is surrounded and shielded by the first shield layer 21 , the ground wire G 1 , the second shield layer 22 , and the end A, as in the first embodiment.
  • the pair of signal wires S 3 and S 4 located near the center is surrounded and shielded by the ground wire G 1 , the first shield layer 21 , the ground wire G 2 , and the second shield layer 22 .
  • the power wires P 1 and P 2 are not shielded because the first and second shield layers 21 and 22 are not provided at positions in which the power wires P 1 and P 2 are arrayed.
  • the signal wires S 3 and S 4 are surrounded by two ground wires G 1 and G 2 at need on both sides in the array direction of the signal wires, and the first and second shield layers 21 and 22 are electrically coupled to the two ground wires G 1 and G 2 at the openings 13 and 14 and the openings 17 and 18 , winch are respectively provided on both sides of the two ground wires G 1 and G 2 . Therefore, because the two ground wires G 1 and G 2 function as a shield to block noise from sides of the signal wires S 3 and S 4 in the array direction, the noise reduction effect can be improved.
  • FIG. 7 is a cross-sectional view orthogonal to the longitudinal direction, illustrating a schematic view of a shielded flat cable according to a sixth embodiment of the present disclosure.
  • a shielded flat cable 6 in the present embodiment includes multiple conductors arrayed parallel to each other, including one ground wire G 0 , the pair of signal wires S 1 and S 2 , one ground wire G 1 , the pair of signal wires S 3 and S 4 for differential transmission, one ground wire G 2 , and two power wires P 1 and P 2 .
  • the signal wires S and the ground wires G are arrayed from the end A side in an array of GSSGSSG.
  • the shielded flat cable 6 includes the first insulating layer 11 and the second insulating layer 12 respectively disposed on both sides of the multiple conductors, and the first shield layer 21 and the second shield layer 22 respectively covering portions of outer surfaces of the first and second insulating layers 11 and 12 . Additionally, as in the third and fourth embodiments, the resin interlayers 31 and 32 for the impedance adjustment are respectively interposed between the first insulating layer 11 and the first shield layer 21 and between the second insulating layer 12 and the second shield layer 22 at positions where the signal wires S 1 and S 2 are located and the signal wires S 3 and S 4 are located to facilitate the adjustment of the characteristic impedance.
  • the ground wire G 0 is disposed on a side opposite to the ground wire G 1 in the array direction of the pair of signal wires S 1 and S 2 (i.e., the end A side), and the openings 15 and 16 are formed in the longitudinal direction of the first and second insulating layers 11 and 12 covering both sides of the ground wire G 0 , and the first and second shield layers 21 and 22 and the ground wire G 0 are electrically coupled at the openings 15 and 16 in the fifth embodiment.
  • the pair of signal wires S 1 and S 2 of the shielded flat cable 6 is surrounded and shielded by the ground wire G 0 , the first shield layer 21 , the ground wire G 1 , and the second shield layer 22 .
  • the pair of signal wires S 3 and S 4 is surrounded and shielded by the ground wire G 1 , the first shield layer 21 , the ground wire G 2 , and the second shield layer 22 .
  • the ground wires G 0 and G 1 and the ground wires G 1 and G 2 are respectively arranged symmetrically on both sides of the pair of signal wires S 1 and S 2 and the pair of signal wires S 3 and S 4 in the array direction, so that excellent transmission characteristics can be obtained.
  • the first and second shield layers 21 and 22 may not be directly contacted at the end A protruding from the side surface of the flat cable in the width direction.
  • the ground wire may be simply arranged on each side of the signal wires of each unit of the signals to be transmitted in the parallel direction and the ground wire may be simply electrically coupled to the shield layers through openings provided at the ground wire.
  • the number of signal wires and the number of ground wires in the shielded flat cable of the present disclosure are not limited to the numbers used in the embodiments described above.
  • the signal wires S and the ground wires G may be arrayed as SSGSSG, or GSSGSSG. Additionally, the disposition of the power wire can be determined as desired. If necessary, the power wire may be surrounded and shielded by the ground wire and the shield layer, as well as the signal wire.
  • FIG. 8 is a cross-sectional view orthogonal to the longitudinal direction, illustrating a schematic view of a shielded flat cable according to a reference example electrically equivalent to the present disclosure.
  • a shielded flat cable 7 of the reference example includes multiple conductors arrayed parallel to each other, including one ground wire G 0 , the pair of signal wires S 1 and S 2 for the differential transmission, one ground wire G 1 , and two power wires P 1 and P 2 .
  • the signal wires S and the ground wires G are arrayed as GSSG, and the ground wires G 0 and G 1 are respectively arranged on both sides of the pair of signal wires S 1 and S 2 in the array direction.
  • the array is the same as the array in the fourth embodiment illustrated in FIG. 5 .
  • the shielded flat cable 7 includes the first insulating layer 11 and the second insulating layer 12 disposed on both sides of the multiple conductors, and the first shield layer 21 and a second shield layer 22 respectively covering portions of outer surfaces of the first and second insulating layers 11 and 12 .
  • the resin interlayers 31 and 32 for the impedance adjustment are respectively interposed between the first insulating layer 11 and the first shield layer 21 and between the second insulating layer 12 and the second shield layer 22 at positions where the signal wires S 1 and S 2 are located, to facilitate the adjustment of the characteristic impedance.
  • the components of the reference example that is, the ground wires G 0 and G 1 , the pair of signal wires S 1 and S 2 for the differential transmission, the two power wires P 1 and P 2 , the first and second insulating layers 11 and 12 , the first and second shield layers 21 and 22 , and the resin interlayers 31 and 32 are the same as the components of the first to sixth embodiments, so the description will be omitted.
  • an opening 15 is provided on a first insulating layer 11 side of the ground wire G 0 through the entire length of the ground wire G 0 in the longitudinal direction, and the ground wire G 0 and the first shield layer 21 are electrically coupled at an exposed surface formed by the opening 15 .
  • an opening 14 is provided on a second insulating layer 12 side of the ground wire G 1 through the entire length in the longitudinal direction, and the ground wire G 1 and the second shield layer 22 are electrically coupled at an exposed surface formed by the opening 14 .
  • the first and second shield layers 21 and 22 are electrically coupled at the end A protruding from the side of the shielded flat cable 1 in the width direction.
  • the ground wire G 0 and the ground wire G 1 are electrically coupled.
  • the first shield layer 21 extends over the signal wires S 1 and S 2 to near the power wire P 1 and the ground wire G 1 .
  • the signal wires S 1 and S 2 are generally surrounded and shielded by the ground wire G 0 , the first shield layer 21 , the ground wire G 1 , and the second shield layer 22 .
  • the ground wire G 1 functions as a shield to block noise from a side of the signal wires S 1 and S 2 in the array direction, and the condition is almost equivalent to the shielded flat cable 4 illustrated in FIG. 5 .
  • the insulating layer is not separated at positions of the ground wires G 0 and G 1 , and the bonding strength of the ground wires G 0 and G 1 with the first and second insulating layers 11 and 12 can be maintained.
  • the first and second shield layers 21 and 22 do not necessarily need to directly come in contact with the end A protruding from a side surface of the flat cable in the width direction.
  • the number of signal wires S and the number of ground wires G are not limited as long as the array of the signal wires S and the ground wires G is “GSSGSSG . . . ”. Further, the disposition of the power wires can be determined as desired.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
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CN209657844U (zh) * 2019-06-03 2019-11-19 深圳Tcl新技术有限公司 扁平线缆及wifi连接线
CN114175394A (zh) * 2019-10-02 2022-03-11 住友电气工业株式会社 双芯平行电缆
KR20210121786A (ko) * 2020-03-31 2021-10-08 주식회사 엘지에너지솔루션 이종금속으로 이루어진 hv 버스 바 및 이의 제조 방법
US11875912B2 (en) * 2020-07-02 2024-01-16 Sumitomo Electric Industries, Ltd. Shielded flat cable
WO2022004074A1 (ja) * 2020-07-02 2022-01-06 住友電気工業株式会社 シールドフラットケーブル
WO2022026597A1 (en) * 2020-07-28 2022-02-03 Lippert Components, Inc. Cord reel and flat power cord
JP2022182050A (ja) * 2021-05-27 2022-12-08 住友電気工業株式会社 シールドフラットケーブル及び基板付きシールドフラットケーブル
CN114005578B (zh) * 2021-11-01 2024-07-02 苏州华旃航天电器有限公司 一种高速ffc排线

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US20210166836A1 (en) 2021-06-03
JPWO2019208247A1 (ja) 2021-05-13
JP7196909B2 (ja) 2022-12-27
WO2019208247A1 (ja) 2019-10-31
CN112005322B (zh) 2022-12-16

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